Objective-C 端的 HUSL。
如果您正在使用 CocoaPods，只需将 pod 'husl-objc' 添加到您的 Podfile 中。
否则，将以下文件包含到您的项目中：
导入 husl-objc.h，该文件定义了以下函数
// Accepts red, green and blue values between 0 and 1, returns the color in hex format, as in "#012C4A"
NSString *rgbToHex(CGFloat red, CGFloat green, CGFloat blue);
// Accepts an hex color, as in "#012C4A", and stores its red, green and blue components with values between 0 and 1.
BOOL hexToRgb(NSString *hex, CGFloat *red, CGFloat *green, CGFloat *blue);
// Hue is a value between 0 and 360, saturation and lightness between 0 and 100. Stores the RGB in values between 0 and 1.
void huslToRgb(CGFloat hue, CGFloat saturation, CGFloat lightness, CGFloat *red, CGFloat *green, CGFloat *blue);
// Red, green and blue values between 0 and 1, stores the husl components with hue between 0 and 360, saturation and lightness between 0 and 100.
void rgbToHusl(CGFloat red, CGFloat green, CGFloat blue, CGFloat *hue, CGFloat *saturation, CGFloat *lightness);
// Hue is a value between 0 and 360, saturation and lightness between 0 and 100. Stores the RGB in values between 0 and 1.
void huslpToRgb(CGFloat hue, CGFloat saturation, CGFloat lightness, CGFloat *red, CGFloat *green, CGFloat *blue);
// Red, green and blue values between 0 and 1, stores the huslp components with hue between 0 and 360, saturation and lightness between 0 and 100.
void rgbToHuslp(CGFloat red, CGFloat green, CGFloat blue, CGFloat *hue, CGFloat *saturation, CGFloat *lightness);